I don't know if this has been mentioned before, but it does tie-in with this hint. If you press the COMMAND key and the = key, you can open up the widget bar. Pressing it again will close the widget bar.

This key combination is indeed valid with a qwerty keyboard. We french-speaking-frog-eaters-azerty-keyboard-users will have to hold the command (aka apple) key while pressing the "-" key at the same time. Same electronic signals, different key layout ... ;-)